The opening shot showing the home is reused in the very next episode I Sing the Body Electric (1962).
Although Rod Serling's opening narration describes the character Alex Walker as 34 years old, Alex Nicol was 46 at the time.
The carpeting on the steps have a design that look like ladies' eyes.
One of 16 of the 156 episodes of The Twilight Zone that involved the appearance of a ghost.